Skip to main content

Full text of "Cars"

See other formats


Advanced Cruise Control 



MakejProjects 



Advanced Cruise Control 

Written By: jim pruett 

SUMMARY 

We will show you how your car can automatically slow down in speed zones using your 
existing cruise control, just made better! It's fun, safe, and doesn't prevent speeding in any 
way. 

Requirements: 

1) Smartphone. 

2) Some soldering. 

This instructable links a database of speed limits called http://www.wikiSPEEDia.org to your 
car's existing cruise control. It will make your drive easier and more relaxing in ways you 
can't imagine. My wife has one, and even though women-hate-gizmos, she uses it every 
day! 

Who am I? I designed the product at gpscruise.com. It was ahead of its time and a 
commercial failure, so I am publishing it here. 

What will it cost? You can build this with about $20 in parts, and no microcontrollers!!! I 
learned long ago that cost is king, and that it is noble to be frugal and low-tech. 

Get involved! If people ask questions, I will provide answers. 

Will it work? Yes it will. 

Here's the project in a nutshell. 



) Make Projects www.makeprojects.com Page 1 of 7 



Advanced Cruise Control 



Step 1 : Get the special cellphone app that is already written and free. It drives the 
headphone jack with two tones when the speed changes. 

Step 2: Buy or make a circuit to convert tones to relay signals. 

Step 3: Connect the relays to your existing cruise control. This step isn't as hard as it 
sounds. 

That's it! 

Email me for more details which you and I will add! It works, trust me. ON ANY CAR newer 
than 2000. 

Email me with any questions: gpscruise@gmail.com 



) Make Projects www.makeprojects.com Page 2 of 7 



Advanced Cruise Control 



Step 1 — Advanced Cruise Control 













gps cruise control 


2 






1 

3 


1 steering wheel 

2 cellphone 

3 steering column 

4DIY 



• We will show you how your car can 
automatically slow down in speed 
zones. 

• Requirements: 1) Smartphone. 2) 
Some soldering. 

• This Make: Project links a database 
of speed limits called 
http://www.wikiSPEEDia.org to 
your car's existing cruise control. 

• It will make your drive easier and 
more relaxing in ways you can't 
imagine. 

• My wife has one, and even though 
women-hate-gizmos, she uses it 
every day! 

• Who am I? I designed the product 
at gpscruise.com. It was ahead of 
its time and a commercial failure, 
so I am publishing it here. 

• What will it cost: You can build this 
with about $20 in parts, and no 
microcontrollers!! 

• Email me with any questions: 
gpscruise@ google mail thingey. 



) Make Projects 



www.makeprojects.com 



Page 3 of 7 



Advanced Cruise Control 



Step 2 




• Buy or build this board I copied 
from: 

http://www.razorconcepts.net . You 
can buy it from them or build it. (I 
want to design a cheaper version; 
one that doesn't need a PCB, just 
protoboard). 

• This board, which I call the DTMF- 
PCB, has inputs: 1) Audio 2) 
+5vDC. This board outputs: 1) TTL 
levels when the audio is DTMF 
0,1, ...9,#,* 

• These TTL levels have to connect 
to two relays or two optoisolators. 

• The important thing is: When the 
DTMF tone comes to this board, it 
clicks in a relay that will simulate 
us pushing the SET/DECEL button 
on our existing cruise control 
circuit. Neat, huh? 



Step 3 

• Parts list (Digikey part no's) 

• LM567CM (DTMF CHIP) [IC1] In stock, believe it or not, at Digikey as of Aug 2010 

• X011-ND (3.579 xtal) [Q1] 

• 3352T-503LF-ND (50k pot) [R4] 

• P4307-ND(0.1uF) [C1] 



) Make Projects 



www.makeprojects.com 



Page 4 of 7 



Advanced Cruise Control 



Step 4 




• Here's how to clip onto your car's 
cruise control. 

• All car manufacturers use the 
same concept, resistors, but each 
manufacturer uses different 
resistors. 

• There are several ways to figure 
out which wires to use, and what 
the resistor values are. There are 
four ways, but if you are lucky you 
will only need the first way. I have 
listed them in order of hardness, 
easy first. 

• 1) First look here to see if your car 
is listed. 

• or 2) Take apart your cruise-control 
buttons (in the steering wheel) and 
use an ohmmeter as you press the 
SET, DECEL, RESUME buttons. 
Trace the wires. 

• or 3) go to the library and ask for 
the ALLDATA auto database. The 
big libraries like Memphis have it. 

• or 4) contact me and I will figure it 
out using (3) above... 



) Make Projects 



www.makeprojects.com 



Page 5 of 7 



Advanced Cruise Control 



Step 5 



SET 


DEC EL 


RESUME 


1 


I 
I 


I 

\ 

I 


RELAY 1,2,3 



• All cars use 2 wires for all the 
cruise functions: SET, DECEL, 
RESUME. 

• You are going to tap onto the 2 
wires. 

• This is a parallel connection. Very 
testable, wouldn't you agree? The 
best part is, if the operator turns 
the cruise off, it's OFF. Very safe! 



Step 6 




• Get a smartphone app. I wrote the 
Android one. 

• 1) Go to the Android Market, and 
get the FREE APP called "Back 
Seat Driver, CruiseControl". 

• 2) Run that app and hit the Cruise 
Control button called "DTMF-0". 

• With the headphone un-connected, 
you will hear your cellphone play 
the DTMF tone for the "0" key. 

• Now you are ready to see if that 
DTMF-0 signal will fool your cruise 
control into thinking you hit the SET 



button.. 



) Make Projects 



www.makeprojects.com 



Page 6 of 7 



Advanced Cruise Control 



Step 7 

• 1) Using an audio cable, connect the cellphone's headphone jack to the DTMF PCB. 

• 2) Convert 12V down to 5V somehow to power the DTMF PCB. 

• 3) Put two relays on the DTMF PCB. (BIG MISSING STEP that I apologize for and will add 
ASAP!) 

• 4) Connect the relays to your cruise-control 2-wire harness. 

Step 8 

• 1) On the Android application called "Back Seat Driver", hit the test button called DTMF-0. 

• 2) Put an ohmmeter across the 2 cruise-control wires. 

• 3) You should see the relays fake-out your cruise control and you should see the 
resistance jump to the right value; R1 , R2, or R3. 

• 4) Now it's time to drive the car and see if the SET button works. 

Step 9 

• After both SET and DECEL work, 

• 1) Turn your cruise control on as you normally would. 

• 2) Drive until you see the speed limit show up on your Android phone running the app 
called "Back Seat Driver". 

• 3) Drive a little above the speed limit and you should hear the SET click on. 

• Don't forget, you can listen to the SET signal by unplugging the headphone jack. 

• Email me if you get stuck: gpscruise@gmail.com 

last generated on 2012-10-31 02:08:56 AM. 



) Make Projects www.makeprojects.com Page 7 of 7